2004 Chevrolet Impala LSFACTORY OEM SERVICE PROCEDURE

Removal Procedure

  1. Relieve the fuel pressure from the fuel system. Refer to Fuel Pressure Relief Procedure .
  2. Clean the fuel rail assembly and the connections.
  3. Disconnect the fuel feed pipe (2) and the fuel return pipe (1) from the fuel rail. Refer to Quick Connect Fitting(s) Service (Metal Collar) .
    4. Fig 1: Disconnecting Fuel Feed Pipe & Fuel Return Pipe (L67)
    GM32404Courtesy of GENERAL MOTORS CORP.
  4. Disconnect the vacuum line from the fuel pressure regulator.
    5. Fig 2: View Of Vacuum Line At Pressure Regulator
    GM155470Courtesy of GENERAL MOTORS CORP.
  5. Remove the ignition coil wires from the coil and retainer clips on top of the supercharger.
  6. Remove the generator brace. Refer toGenerator Brace Replacement (3.4L) or Generator Brace Replacement (3.8L) in Engine Electrical.
  7. Remove the bypass valve actuator. Refer to Bypass Valve Actuator Replacement .
  8. Disconnect the fuel injector electrical connectors.
    9. Fig 3: View Of Fuel Injector Electrical Connectors
    GM198402Courtesy of GENERAL MOTORS CORP.
  9. Remove the fuel injector electrical harness clips holding harness to front and the rear of the fuel rail.
    10. Fig 4: Removing Fuel Injector Electrical Harness Clips
    GM198404Courtesy of GENERAL MOTORS CORP.
  10. Remove the engine mount strut bolt and nut from the left engine mount strut.
  11. Reposition the wiring harness from the left engine mount strut bracket.
    12. Fig 5: Left Engine Mount Strut Bolt & Nut
    GM327466Courtesy of GENERAL MOTORS CORP.
  12. Remove the fuel rail hold-down nuts.
  13. Remove the fuel rail hold-down stud.
  14. Remove the fuel rail with equal force on both sides of the fuel rail.
    15. Fig 6: Removing Fuel Rail (L67)
    GM12256Courtesy of GENERAL MOTORS CORP.
Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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